®
ICL3224, ICL3226, ICL3238, ICL3244
Data Sheet
November 2002
FN4876.6
1 Microamp, +3V to +5.5V, 250kbps,
RS-232 Transceivers with Enhanced
Automatic Powerdown
The Intersil ICL32XX devices are 3.0V to 5.5V powered
RS-232 transmitters/receivers which meet ElA/TIA-232 and
V.28/V.24 specifications, even at V
CC
= 3.0V. Targeted
applications are PDAs, Palmtops, and notebook and laptop
computers where the low operational, and even lower
standby, power consumption is critical. Efficient on-chip
charge pumps, coupled with manual and enhanced
automatic powerdown functions, reduce the standby supply
current to a 1µA trickle. Small footprint packaging, and the
use of small, low value capacitors ensure board space
savings as well. Data rates greater than 250kbps are
guaranteed at worst case load conditions. This family is fully
compatible with 3.3V only systems, mixed 3.3V and 5.0V
systems, and 5.0V only systems.
The ICL3244 is a 3 driver, 5 receiver device that provides a
complete serial port suitable for laptop or notebook
computers. The ICL3244/38 also include a noninverting
always-active receiver for RING INDICATOR monitoring.
These devices feature an
enhanced automatic
powerdown
function which powers down the on-chip power-
supply and driver circuits. This occurs when all receiver and
transmitter inputs detect no signal transitions for a period of
30sec. These devices power back up, automatically,
whenever they sense a transition on any transmitter or
receiver input.
Table 1 summarizes the features of the devices represented
by this data sheet, while Application Note AN9863
summarizes the features of each device comprising the
ICL32XX 3V family.
Features
•
±
15kV ESD Protected (Human Body Model)
• Manual and Enhanced Automatic Powerdown Features
• Drop in Replacements for MAX3224, MAX3226,
MAX3238, MAX3244
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Latch-Up Free
• RS-232 Compatible with V
CC
= 2.7V
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Flow-Through Pinout (ICL3238)
• Guaranteed Mouse Driveability (ICL3244)
• “Ready to Transmit” Indicator Output (ICL3224/26)
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/µs
• Wide Power Supply Range . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . . .1µA
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Modems, Printers and other Peripherals
- Digital Cameras
- Cellular/Mobile Phones
- Data Cradles
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• AN9863, “3V to +5.5V, 250k-1Mbps, RS-232
Transmitters/Receivers”
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ICL3224
ICL3226
ICL3238
ICL3244
NO. OF NO. OF
Tx.
Rx.
2
1
5
3
2
1
3
5
NO. OF
MONITOR Rx.
(R
OUTB
)
0
0
1
1
DATA
RATE
(kbps)
250
250
250
250
Rx. ENABLE
FUNCTION?
NO
NO
NO
NO
READY
OUTPUT?
YES
YES
NO
NO
MANUAL
POWER-
DOWN?
YES
YES
YES
YES
ENHANCED
AUTOMATIC
POWERDOWN
YES
YES
YES
YES
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ICL3224, ICL3226, ICL3238, ICL3244
Ordering Information
(NOTE 1)
PART NO.
ICL3224CA
ICL3224IA
ICL3224CP
ICL3226CA
ICL3226IA
ICL3238CA
ICL3238IA
ICL3244CA
TEMP.
RANGE (
o
C)
0 to 70
-40 to 85
0 to 70
0 to 70
-40 to 85
0 to 70
-40 to 85
0 to 70
PACKAGE
20 Ld SSOP
20 Ld SSOP
20 Ld PDIP
16 Ld SSOP
16 Ld SSOP
28 Ld SSOP
28 Ld SSOP
28 Ld SSOP
PKG. NO.
M20.209
M20.209
E20.3
M16.209
M16.209
M28.209
M28.209
M28.209
Ordering Information
(NOTE 1)
PART NO.
ICL3244IA
ICL3244CB
ICL3244IB
ICL3244CV
ICL3244IV
NOTE:
TEMP.
RANGE (
o
C)
-40 to 85
0 to 70
-40 to 85
0 to 70
-40 to 85
(Continued)
PACKAGE
28 Ld SSOP
28 Ld SOIC
28 Ld SOIC
28 Ld TSSOP
28 Ld TSSOP
PKG. NO.
M28.209
M28.3
M28.3
M28.173
M28.173
1. Most surface mount devices are available on tape and reel; add
“-T” to suffix.
Pinouts
ICL3224 (PDIP, SSOP)
TOP VIEW
READY 1
C1+ 2
V+
3
20 FORCEOFF
19 V
CC
18 GND
17 T1
OUT
16 R1
IN
15 R1
OUT
14 FORCEON
13 T1
IN
12 T2
IN
11 INVALID
READY 1
C1+ 2
V+
3
16 FORCEOFF
15 V
CC
14 GND
13 T1
OUT
12 FORCEON
11 T1
IN
10 INVALID
9 R1
OUT
ICL3226 (SSOP)
TOP VIEW
C1- 4
C2+ 5
C2- 6
V- 7
T2
OUT
8
R2
IN
9
R2
OUT
10
C1- 4
C2+ 5
C2- 6
V- 7
R1
IN
8
ICL3238 (SSOP)
TOP VIEW
C2+ 1
GND 2
C2-
3
28 C1+
27 V+
26 V
CC
25 C1-
24 T1
IN
23 T2
IN
22 T3
IN
21 R1
OUT
20 R2
OUT
19 T4
IN
18 R3
OUT
17 T5
IN
16 R1
OUTB
15 INVALID
ICL3244 (SOIC, SSOP, TSSOP)
TOP VIEW
C2+ 1
C2- 2
V-
3
28 C1+
27 V+
26 V
CC
25 GND
24 C1-
23 FORCEON
22 FORCEOFF
21 INVALID
20 R2
OUTB
19 R1
OUT
18 R2
OUT
17 R3
OUT
16 R4
OUT
15 R5
OUT
V- 4
T1
OUT
5
T2
OUT
6
T3
OUT
7
R1
IN
8
R2
IN
9
T4
OUT
10
R3
IN
11
T5
OUT
12
FORCEON 13
FORCEOFF 14
R1
IN
4
R2
IN
5
R3
IN
6
R4
IN
7
R5
IN
8
T1
OUT
9
T2
OUT
10
T3
OUT
11
T3
IN
12
T2
IN
13
T1
IN
14
2
ICL3224, ICL3226, ICL3238, ICL3244
Pin Descriptions
PIN
V
CC
V+
V-
GND
C1+
C1-
C2+
C2-
T
IN
T
OUT
R
IN
R
OUT
R
OUTB
INVALID
READY
System power supply input (3.0V to 5.5V).
Internally generated positive transmitter supply (+5.5V).
Internally generated negative transmitter supply (-5.5V).
Ground connection.
External capacitor (voltage doubler) is connected to this lead.
External capacitor (voltage doubler) is connected to this lead.
External capacitor (voltage inverter) is connected to this lead.
External capacitor (voltage inverter) is connected to this lead.
TTL/CMOS compatible transmitter Inputs.
RS-232 level (nominally
±5.5V)
transmitter outputs.
RS-232 compatible receiver inputs.
TTL/CMOS level receiver outputs.
TTL/CMOS level, noninverting, always enabled receiver outputs.
Active low output that indicates if no valid RS-232 levels are present on any receiver input.
Active high output that indicates when the ICL32XX is ready to transmit (i.e., V-
≤
-4V)
FUNCTION
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2).
FORCEON
Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).
Typical Operating Circuits
ICL3224
+3.3V
+
0.1µF
2
+
4
5
+
6
13
T1
IN
12
T2
IN
TTL/CMOS
LOGIC
LEVELS
15
R1
OUT
10
R2
OUT
1
READY
14
FORCEON
GND
18
FORCEOFF
INVALID
R
2
5kΩ
20
11
R
1
5kΩ
9
R2
IN
12
16
R1
IN
C1+
C1-
C2+
C2-
T
1
T
2
17
T1
OUT
8
T2
OUT
RS-232
LEVELS
TTL/CMOS
LOGIC
LEVELS
+3.3V
19
V
CC
V+
3
+ C
3
0.1µF
C
4
+0.1µF
C
1
0.1µF
C
2
0.1µF
+
ICL3226
0.1µF
C1+
C1-
C2+
C2-
15
V
CC
3
V+
V- 7
T
1
13
T1
OUT
8
R
1
5kΩ
R1
IN
RS-232
LEVELS
+ C
3
0.1µF
C
4
+ 0.1µF
C
1
0.1µF
C
2
0.1µF
2
+
4
5
+
6
11
T1
IN
9
V- 7
R1
OUT
1
READY
16
FORCEOFF
10
V
CC
TO POWER
CONTROL
LOGIC
FORCEON
GND
14
INVALID
V
CC
TO POWER
CONTROL
LOGIC
3
ICL3224, ICL3226, ICL3238, ICL3244
Typical Operating Circuits
ICL3238
C
3
(OPTIONAL
CONNECTION, NOTE 2)
+3.3V
0.1µF
28
+
25
1
+
3
24
T1
IN
23
T2
IN
22
T3
IN
19
T4
IN
17
T5
IN
TTL/CMOS
LOGIC
LEVELS
16
R1
OUTB
21
R1
OUT
20
R2
OUT
18
R3
OUT
13
FORCEON
V
CC
TO POWER
CONTROL
LOGIC
14
FORCEOFF
15
INVALID
GND
2
V
CC
TO POWER
CONTROL LOGIC
22
FORCEOFF
21
INVALID
GND
25
R
3
5kΩ
R
2
5kΩ
R
1
5kΩ
8
R1
IN
9
R2
IN
11
R3
IN
17
R3
OUT
RS-232
LEVELS
16
R4
OUT
15
R5
OUT
23
R
5
FORCEON
5kΩ
R
4
5kΩ
8
R5
IN
R
3
5kΩ
7
R4
IN
6
R3
IN
RS-232
LEVELS
T
4
T
3
T
3
T
2
C1+
C1-
C2+
C2-
T
1
V-
+
+
26
V
CC
27
V+
4
+
C
3
0.1µF
NOTE 3
C
4
0.1µF
+
+3.3V
+
0.1µF
28
+
24
1
+
2
14
T1
IN
13
T2
IN
12
RS-232
LEVELS
T3
IN
20
R2
OUTB
19
TTL/CMOS
LOGIC
LEVELS
R1
OUT
18
R2
OUT
R
2
5kΩ
R
1
5kΩ
5
R2
IN
4
R1
IN
T
3
T
2
C1+
C1-
C2+
C2-
T
1
V-
(Continued)
ICL3244
26
V
CC
27
V+
3
+
C
3
0.1µF
C
1
0.1µF
NOTE 3
C
2
0.1µF
C
1
0.1µF
C
2
0.1µF
C
4
0.1µF
+
9
T1
OUT
10
T2
OUT
11
T3
OUT
RS-232
LEVELS
5
T1
OUT
6
T2
OUT
7
T3
OUT
10
T4
OUT
12
T5
OUT
NOTES:
2. THE NEGATIVE TERMINAL OF C
3
CAN BE CONNECTED TO EITHER
V
CC
OR GND.
3. FOR V
CC
= 3.15V (3.3V -5%), USE C
1
- C
4
= 0.1µF OR GREATER. FOR
V
CC
= 3.0V (3.3V -10%), USE C
1
- C
4
= 0.22µF.
4
ICL3224, ICL3226, ICL3238, ICL3244
Absolute Maximum Ratings
V
CC
to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
V- to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V
V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Input Voltages
T
IN
, FORCEOFF, FORCEON . . . . . . . . . . . . . . . . . . -0.3V to 6V
R
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±25V
Output Voltages
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±13.2V
R
OUT
, INVALID, READY . . . . . . . . . . . . . . . . -0.3V to V
CC
+0.3V
Short Circuit Duration
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical, Note 4)
θ
JA
(
o
C/W)
20 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . .
80
28 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
75
16 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . .
140
20 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . .
125
28 Ld SSOP and TSSOP Packages . . . . . . . . . . . .
100
Moisture Sensitivity (see Technical Brief TB363)
All Packages Not Listed Below . . . . . . . . . . . . . . . . . . . . . Level 1
16 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 2
Maximum Junction Temperature (Plastic Package) . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
o
C
(SOIC, SSOP, TSSOP - Lead Tips Only)
Operating Conditions
Temperature Range
ICL32XXC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
o
C to 70
o
C
ICL32XXI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85
o
C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
4.
θ
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: V
CC
= 3V to 5.5V, C
1
- C
4
= 0.1
µ
F (ICL3238: C
1
- C
4
= 0.22
µ
F @ V
CC
= 3V); Unless
Otherwise Specified. Typicals are at T
A
= 25
o
C
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
µA
µA
mA
mA
PARAMETER
DC CHARACTERISTICS
Supply Current, Automatic
Powerdown
Supply Current, Powerdown
Supply Current,
Automatic Powerdown Disabled
All R
IN
Open, FORCEON = GND, FORCEOFF = V
CC
FORCEOFF = GND
All Outputs Unloaded, FORCEON ICL3244, V
CC
= 3V
= FORCEOFF = V
CC
All Others, V
CC
= 3.15V
T
IN
, FORCEON, FORCEOFF
T
IN
, FORCEON, FORCEOFF
V
CC
= 3.3V
V
CC
= 5.0V
25
25
25
25
-
-
-
-
1.0
1.0
0.3
0.3
10
10
1.0
1.0
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
Input Logic Threshold High
Full
Full
Full
25
T
IN
, FORCEON, FORCEOFF
FORCEOFF = GND
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Full
Full
Full
Full
-
2.0
2.4
-
-
-
-
-
-
-
0.5
±0.01
±0.05
-
0.8
-
-
-
±1.0
±10
0.4
-
V
V
V
V
µA
µA
V
V
Transmitter Input Hysteresis
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
V
CC
= 3.3V
V
CC
= 5.0V
Input Threshold High
V
CC
= 3.3V
V
CC
= 5.0V
Input Hysteresis
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
All Transmitter Outputs Loaded with 3kΩ to Ground
V
CC
-0.6 V
CC
-0.1
-25
0.6
0.8
-
-
-
3
±5.0
-
1.2
1.5
1.5
1.8
0.5
5
±5.4
Full
25
25
25
25
25
25
25
-
-
2.4
2.4
-
7
V
V
V
V
V
V
kΩ
Full
-
V
5
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